1 /* $NetBSD: if_gre.c,v 1.134 2008/05/15 04:03:53 dyoung Exp $ */ 2 3 /* 4 * Copyright (c) 1998, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Heiko W.Rupp <hwr@pilhuhn.de> 9 * 10 * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de> 11 * 12 * GRE over UDP/IPv4/IPv6 sockets contributed by David Young <dyoung@NetBSD.org> 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 * 35 * This material is based upon work partially supported by NSF 36 * under Contract No. NSF CNS-0626584. 37 */ 38 39 /* 40 * Encapsulate L3 protocols into IP 41 * See RFC 1701 and 1702 for more details. 42 * If_gre is compatible with Cisco GRE tunnels, so you can 43 * have a NetBSD box as the other end of a tunnel interface of a Cisco 44 * router. See gre(4) for more details. 45 */ 46 47 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: if_gre.c,v 1.134 2008/05/15 04:03:53 dyoung Exp $"); 49 50 #include "opt_gre.h" 51 #include "opt_inet.h" 52 #include "bpfilter.h" 53 54 #ifdef INET 55 #include <sys/param.h> 56 #include <sys/file.h> 57 #include <sys/filedesc.h> 58 #include <sys/malloc.h> 59 #include <sys/mallocvar.h> 60 #include <sys/mbuf.h> 61 #include <sys/proc.h> 62 #include <sys/domain.h> 63 #include <sys/protosw.h> 64 #include <sys/socket.h> 65 #include <sys/socketvar.h> 66 #include <sys/ioctl.h> 67 #include <sys/queue.h> 68 #include <sys/intr.h> 69 #if __NetBSD__ 70 #include <sys/systm.h> 71 #include <sys/sysctl.h> 72 #include <sys/kauth.h> 73 #endif 74 75 #include <sys/kernel.h> 76 #include <sys/mutex.h> 77 #include <sys/condvar.h> 78 #include <sys/kthread.h> 79 80 #include <sys/cpu.h> 81 82 #include <net/ethertypes.h> 83 #include <net/if.h> 84 #include <net/if_types.h> 85 #include <net/netisr.h> 86 #include <net/route.h> 87 88 #ifdef INET 89 #include <netinet/in.h> 90 #include <netinet/in_systm.h> 91 #include <netinet/in_var.h> 92 #include <netinet/ip.h> 93 #include <netinet/ip_var.h> 94 #else 95 #error "Huh? if_gre without inet?" 96 #endif 97 98 99 #ifdef NETATALK 100 #include <netatalk/at.h> 101 #include <netatalk/at_var.h> 102 #include <netatalk/at_extern.h> 103 #endif 104 105 #if NBPFILTER > 0 106 #include <sys/time.h> 107 #include <net/bpf.h> 108 #endif 109 110 #include <net/if_gre.h> 111 112 #include <compat/sys/socket.h> 113 #include <compat/sys/sockio.h> 114 /* 115 * It is not easy to calculate the right value for a GRE MTU. 116 * We leave this task to the admin and use the same default that 117 * other vendors use. 118 */ 119 #define GREMTU 1476 120 121 #ifdef GRE_DEBUG 122 int gre_debug = 0; 123 #define GRE_DPRINTF(__sc, ...) \ 124 do { \ 125 if (__predict_false(gre_debug || \ 126 ((__sc)->sc_if.if_flags & IFF_DEBUG) != 0)) { \ 127 printf("%s.%d: ", __func__, __LINE__); \ 128 printf(__VA_ARGS__); \ 129 } \ 130 } while (/*CONSTCOND*/0) 131 #else 132 #define GRE_DPRINTF(__sc, __fmt, ...) do { } while (/*CONSTCOND*/0) 133 #endif /* GRE_DEBUG */ 134 135 int ip_gre_ttl = GRE_TTL; 136 MALLOC_DEFINE(M_GRE_BUFQ, "gre_bufq", "gre mbuf queue"); 137 138 static int gre_clone_create(struct if_clone *, int); 139 static int gre_clone_destroy(struct ifnet *); 140 141 static struct if_clone gre_cloner = 142 IF_CLONE_INITIALIZER("gre", gre_clone_create, gre_clone_destroy); 143 144 static int gre_input(struct gre_softc *, struct mbuf *, int, 145 const struct gre_h *); 146 static bool gre_is_nullconf(const struct gre_soparm *); 147 static int gre_output(struct ifnet *, struct mbuf *, 148 const struct sockaddr *, struct rtentry *); 149 static int gre_ioctl(struct ifnet *, u_long, void *); 150 static int gre_getsockname(struct socket *, struct mbuf *, struct lwp *); 151 static int gre_getpeername(struct socket *, struct mbuf *, struct lwp *); 152 static int gre_getnames(struct socket *, struct lwp *, 153 struct sockaddr_storage *, struct sockaddr_storage *); 154 static void gre_clearconf(struct gre_soparm *, bool); 155 static int gre_soreceive(struct socket *, struct mbuf **); 156 static int gre_sosend(struct socket *, struct mbuf *); 157 static struct socket *gre_reconf(struct gre_softc *, const struct gre_soparm *); 158 159 static bool gre_fp_send(struct gre_softc *, enum gre_msg, file_t *); 160 static bool gre_fp_recv(struct gre_softc *); 161 static void gre_fp_recvloop(void *); 162 163 static int 164 nearest_pow2(size_t len0) 165 { 166 size_t len, mid; 167 168 if (len0 == 0) 169 return 1; 170 171 for (len = len0; (len & (len - 1)) != 0; len &= len - 1) 172 ; 173 174 mid = len | (len >> 1); 175 176 /* avoid overflow */ 177 if ((len << 1) < len) 178 return len; 179 if (len0 >= mid) 180 return len << 1; 181 return len; 182 } 183 184 static struct gre_bufq * 185 gre_bufq_init(struct gre_bufq *bq, size_t len0) 186 { 187 size_t len; 188 189 len = nearest_pow2(len0); 190 191 memset(bq, 0, sizeof(*bq)); 192 bq->bq_buf = malloc(len * sizeof(struct mbuf *), M_GRE_BUFQ, M_WAITOK); 193 bq->bq_len = len; 194 bq->bq_lenmask = len - 1; 195 196 return bq; 197 } 198 199 static bool 200 gre_bufq_empty(struct gre_bufq *bq) 201 { 202 return bq->bq_prodidx == bq->bq_considx; 203 } 204 205 static struct mbuf * 206 gre_bufq_dequeue(struct gre_bufq *bq) 207 { 208 struct mbuf *m; 209 210 if (gre_bufq_empty(bq)) 211 return NULL; 212 213 m = bq->bq_buf[bq->bq_considx]; 214 bq->bq_considx = (bq->bq_considx + 1) & bq->bq_lenmask; 215 216 return m; 217 } 218 219 static void 220 gre_bufq_purge(struct gre_bufq *bq) 221 { 222 struct mbuf *m; 223 224 while ((m = gre_bufq_dequeue(bq)) != NULL) 225 m_freem(m); 226 } 227 228 static int 229 gre_bufq_enqueue(struct gre_bufq *bq, struct mbuf *m) 230 { 231 int next; 232 233 next = (bq->bq_prodidx + 1) & bq->bq_lenmask; 234 235 if (next == bq->bq_considx) { 236 bq->bq_drops++; 237 return ENOBUFS; 238 } 239 240 bq->bq_buf[bq->bq_prodidx] = m; 241 bq->bq_prodidx = next; 242 return 0; 243 } 244 245 static void 246 greintr(void *arg) 247 { 248 struct gre_softc *sc = (struct gre_softc *)arg; 249 struct socket *so = sc->sc_soparm.sp_so; 250 int rc; 251 struct mbuf *m; 252 253 KASSERT(so != NULL); 254 255 sc->sc_send_ev.ev_count++; 256 GRE_DPRINTF(sc, "enter\n"); 257 while ((m = gre_bufq_dequeue(&sc->sc_snd)) != NULL) { 258 /* XXX handle ENOBUFS? */ 259 if ((rc = gre_sosend(so, m)) != 0) 260 GRE_DPRINTF(sc, "gre_sosend failed %d\n", rc); 261 } 262 } 263 264 /* Caller must hold sc->sc_mtx. */ 265 static void 266 gre_wait(struct gre_softc *sc) 267 { 268 sc->sc_waiters++; 269 cv_wait(&sc->sc_condvar, &sc->sc_mtx); 270 sc->sc_waiters--; 271 } 272 273 static void 274 gre_fp_wait(struct gre_softc *sc) 275 { 276 sc->sc_fp_waiters++; 277 cv_wait(&sc->sc_fp_condvar, &sc->sc_mtx); 278 sc->sc_fp_waiters--; 279 } 280 281 static void 282 gre_evcnt_detach(struct gre_softc *sc) 283 { 284 evcnt_detach(&sc->sc_unsupp_ev); 285 evcnt_detach(&sc->sc_pullup_ev); 286 evcnt_detach(&sc->sc_error_ev); 287 evcnt_detach(&sc->sc_block_ev); 288 evcnt_detach(&sc->sc_recv_ev); 289 290 evcnt_detach(&sc->sc_oflow_ev); 291 evcnt_detach(&sc->sc_send_ev); 292 } 293 294 static void 295 gre_evcnt_attach(struct gre_softc *sc) 296 { 297 evcnt_attach_dynamic(&sc->sc_recv_ev, EVCNT_TYPE_MISC, 298 NULL, sc->sc_if.if_xname, "recv"); 299 evcnt_attach_dynamic(&sc->sc_block_ev, EVCNT_TYPE_MISC, 300 &sc->sc_recv_ev, sc->sc_if.if_xname, "would block"); 301 evcnt_attach_dynamic(&sc->sc_error_ev, EVCNT_TYPE_MISC, 302 &sc->sc_recv_ev, sc->sc_if.if_xname, "error"); 303 evcnt_attach_dynamic(&sc->sc_pullup_ev, EVCNT_TYPE_MISC, 304 &sc->sc_recv_ev, sc->sc_if.if_xname, "pullup failed"); 305 evcnt_attach_dynamic(&sc->sc_unsupp_ev, EVCNT_TYPE_MISC, 306 &sc->sc_recv_ev, sc->sc_if.if_xname, "unsupported"); 307 308 evcnt_attach_dynamic(&sc->sc_send_ev, EVCNT_TYPE_MISC, 309 NULL, sc->sc_if.if_xname, "send"); 310 evcnt_attach_dynamic(&sc->sc_oflow_ev, EVCNT_TYPE_MISC, 311 &sc->sc_send_ev, sc->sc_if.if_xname, "overflow"); 312 } 313 314 static int 315 gre_clone_create(struct if_clone *ifc, int unit) 316 { 317 int rc; 318 struct gre_softc *sc; 319 struct gre_soparm *sp; 320 321 sc = malloc(sizeof(struct gre_softc), M_DEVBUF, M_WAITOK|M_ZERO); 322 mutex_init(&sc->sc_mtx, MUTEX_DRIVER, IPL_SOFTNET); 323 cv_init(&sc->sc_condvar, "gre wait"); 324 cv_init(&sc->sc_fp_condvar, "gre fp"); 325 326 snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d", 327 ifc->ifc_name, unit); 328 sc->sc_if.if_softc = sc; 329 sc->sc_if.if_type = IFT_TUNNEL; 330 sc->sc_if.if_addrlen = 0; 331 sc->sc_if.if_hdrlen = sizeof(struct ip) + sizeof(struct gre_h); 332 sc->sc_if.if_dlt = DLT_NULL; 333 sc->sc_if.if_mtu = GREMTU; 334 sc->sc_if.if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 335 sc->sc_if.if_output = gre_output; 336 sc->sc_if.if_ioctl = gre_ioctl; 337 sp = &sc->sc_soparm; 338 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 339 sintocsa(&in_any)); 340 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 341 sintocsa(&in_any)); 342 sp->sp_proto = IPPROTO_GRE; 343 sp->sp_type = SOCK_RAW; 344 345 sc->sc_fd = -1; 346 347 rc = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, gre_fp_recvloop, sc, 348 NULL, sc->sc_if.if_xname); 349 350 if (rc != 0) 351 return -1; 352 353 gre_evcnt_attach(sc); 354 355 gre_bufq_init(&sc->sc_snd, 17); 356 sc->sc_if.if_flags |= IFF_LINK0; 357 if_attach(&sc->sc_if); 358 if_alloc_sadl(&sc->sc_if); 359 #if NBPFILTER > 0 360 bpfattach(&sc->sc_if, DLT_NULL, sizeof(uint32_t)); 361 #endif 362 sc->sc_state = GRE_S_IDLE; 363 return 0; 364 } 365 366 static int 367 gre_clone_destroy(struct ifnet *ifp) 368 { 369 int s; 370 struct gre_softc *sc = ifp->if_softc; 371 372 GRE_DPRINTF(sc, "\n"); 373 374 #if NBPFILTER > 0 375 bpfdetach(ifp); 376 #endif 377 s = splnet(); 378 if_detach(ifp); 379 380 /* Some LWPs may still wait in gre_ioctl_lock(), however, 381 * no new LWP will enter gre_ioctl_lock(), because ifunit() 382 * cannot locate the interface any longer. 383 */ 384 mutex_enter(&sc->sc_mtx); 385 GRE_DPRINTF(sc, "\n"); 386 while (sc->sc_state != GRE_S_IDLE) 387 gre_wait(sc); 388 GRE_DPRINTF(sc, "\n"); 389 sc->sc_state = GRE_S_DIE; 390 cv_broadcast(&sc->sc_condvar); 391 while (sc->sc_waiters > 0) 392 cv_wait(&sc->sc_condvar, &sc->sc_mtx); 393 /* At this point, no other LWP will access the gre_softc, so 394 * we can release the mutex. 395 */ 396 mutex_exit(&sc->sc_mtx); 397 GRE_DPRINTF(sc, "\n"); 398 /* Note that we must not hold the mutex while we call gre_reconf(). */ 399 gre_reconf(sc, NULL); 400 401 mutex_enter(&sc->sc_mtx); 402 sc->sc_msg = GRE_M_STOP; 403 cv_signal(&sc->sc_fp_condvar); 404 while (sc->sc_fp_waiters > 0) 405 cv_wait(&sc->sc_fp_condvar, &sc->sc_mtx); 406 mutex_exit(&sc->sc_mtx); 407 408 splx(s); 409 410 cv_destroy(&sc->sc_condvar); 411 mutex_destroy(&sc->sc_mtx); 412 gre_evcnt_detach(sc); 413 free(sc, M_DEVBUF); 414 415 return 0; 416 } 417 418 static void 419 gre_receive(struct socket *so, void *arg, int waitflag) 420 { 421 struct gre_softc *sc = (struct gre_softc *)arg; 422 int rc; 423 const struct gre_h *gh; 424 struct mbuf *m; 425 426 GRE_DPRINTF(sc, "enter\n"); 427 428 sc->sc_recv_ev.ev_count++; 429 430 rc = gre_soreceive(so, &m); 431 /* TBD Back off if ECONNREFUSED (indicates 432 * ICMP Port Unreachable)? 433 */ 434 if (rc == EWOULDBLOCK) { 435 GRE_DPRINTF(sc, "EWOULDBLOCK\n"); 436 sc->sc_block_ev.ev_count++; 437 return; 438 } else if (rc != 0 || m == NULL) { 439 GRE_DPRINTF(sc, "%s: rc %d m %p\n", 440 sc->sc_if.if_xname, rc, (void *)m); 441 sc->sc_error_ev.ev_count++; 442 return; 443 } 444 if (m->m_len < sizeof(*gh) && (m = m_pullup(m, sizeof(*gh))) == NULL) { 445 GRE_DPRINTF(sc, "m_pullup failed\n"); 446 sc->sc_pullup_ev.ev_count++; 447 return; 448 } 449 gh = mtod(m, const struct gre_h *); 450 451 if (gre_input(sc, m, 0, gh) == 0) { 452 sc->sc_unsupp_ev.ev_count++; 453 GRE_DPRINTF(sc, "dropping unsupported\n"); 454 m_freem(m); 455 } 456 } 457 458 static void 459 gre_upcall_add(struct socket *so, void *arg) 460 { 461 /* XXX What if the kernel already set an upcall? */ 462 KASSERT((so->so_rcv.sb_flags & SB_UPCALL) == 0); 463 so->so_upcallarg = arg; 464 so->so_upcall = gre_receive; 465 so->so_rcv.sb_flags |= SB_UPCALL; 466 } 467 468 static void 469 gre_upcall_remove(struct socket *so) 470 { 471 so->so_rcv.sb_flags &= ~SB_UPCALL; 472 so->so_upcallarg = NULL; 473 so->so_upcall = NULL; 474 } 475 476 static int 477 gre_socreate(struct gre_softc *sc, const struct gre_soparm *sp, int *fdout) 478 { 479 const struct protosw *pr; 480 int fd, rc; 481 struct mbuf *m; 482 struct sockaddr *sa; 483 struct socket *so; 484 sa_family_t af; 485 486 GRE_DPRINTF(sc, "enter\n"); 487 488 af = sp->sp_src.ss_family; 489 rc = fsocreate(af, NULL, sp->sp_type, sp->sp_proto, curlwp, &fd); 490 if (rc != 0) { 491 GRE_DPRINTF(sc, "fsocreate failed\n"); 492 return rc; 493 } 494 495 if ((rc = fd_getsock(fd, &so)) != 0) 496 return rc; 497 498 if ((m = getsombuf(so, MT_SONAME)) == NULL) { 499 rc = ENOBUFS; 500 goto out; 501 } 502 sa = mtod(m, struct sockaddr *); 503 sockaddr_copy(sa, MIN(MLEN, sizeof(sp->sp_src)), sstocsa(&sp->sp_src)); 504 m->m_len = sp->sp_src.ss_len; 505 506 if ((rc = sobind(so, m, curlwp)) != 0) { 507 GRE_DPRINTF(sc, "sobind failed\n"); 508 goto out; 509 } 510 511 sockaddr_copy(sa, MIN(MLEN, sizeof(sp->sp_dst)), sstocsa(&sp->sp_dst)); 512 m->m_len = sp->sp_dst.ss_len; 513 514 solock(so); 515 if ((rc = soconnect(so, m, curlwp)) != 0) { 516 GRE_DPRINTF(sc, "soconnect failed\n"); 517 sounlock(so); 518 goto out; 519 } 520 sounlock(so); 521 522 /* XXX convert to a (new) SOL_SOCKET call */ 523 *mtod(m, int *) = ip_gre_ttl; 524 m->m_len = sizeof(int); 525 pr = so->so_proto; 526 KASSERT(pr != NULL); 527 rc = sosetopt(so, IPPROTO_IP, IP_TTL, m); 528 m = NULL; 529 if (rc != 0) { 530 GRE_DPRINTF(sc, "sosetopt ttl failed\n"); 531 rc = 0; 532 } 533 rc = sosetopt(so, SOL_SOCKET, SO_NOHEADER, m_intopt(so, 1)); 534 if (rc != 0) { 535 GRE_DPRINTF(sc, "sosetopt SO_NOHEADER failed\n"); 536 rc = 0; 537 } 538 out: 539 m_freem(m); 540 541 if (rc != 0) 542 fd_close(fd); 543 else { 544 fd_putfile(fd); 545 *fdout = fd; 546 } 547 548 return rc; 549 } 550 551 static int 552 gre_sosend(struct socket *so, struct mbuf *top) 553 { 554 struct mbuf **mp; 555 struct proc *p; 556 long space, resid; 557 int error; 558 struct lwp * const l = curlwp; 559 560 p = l->l_proc; 561 562 resid = top->m_pkthdr.len; 563 if (p) 564 l->l_ru.ru_msgsnd++; 565 #define snderr(errno) { error = errno; goto release; } 566 567 solock(so); 568 if ((error = sblock(&so->so_snd, M_NOWAIT)) != 0) 569 goto out; 570 if (so->so_state & SS_CANTSENDMORE) 571 snderr(EPIPE); 572 if (so->so_error) { 573 error = so->so_error; 574 so->so_error = 0; 575 goto release; 576 } 577 if ((so->so_state & SS_ISCONNECTED) == 0) { 578 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 579 if ((so->so_state & SS_ISCONFIRMING) == 0) 580 snderr(ENOTCONN); 581 } else 582 snderr(EDESTADDRREQ); 583 } 584 space = sbspace(&so->so_snd); 585 if (resid > so->so_snd.sb_hiwat) 586 snderr(EMSGSIZE); 587 if (space < resid) 588 snderr(EWOULDBLOCK); 589 mp = ⊤ 590 /* 591 * Data is prepackaged in "top". 592 */ 593 if (so->so_state & SS_CANTSENDMORE) 594 snderr(EPIPE); 595 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, top, NULL, NULL, l); 596 top = NULL; 597 mp = ⊤ 598 release: 599 sbunlock(&so->so_snd); 600 out: 601 sounlock(so); 602 if (top != NULL) 603 m_freem(top); 604 return error; 605 } 606 607 /* This is a stripped-down version of soreceive() that will never 608 * block. It will support SOCK_DGRAM sockets. It may also support 609 * SOCK_SEQPACKET sockets. 610 */ 611 static int 612 gre_soreceive(struct socket *so, struct mbuf **mp0) 613 { 614 struct mbuf *m, **mp; 615 int flags, len, error, type; 616 const struct protosw *pr; 617 struct mbuf *nextrecord; 618 619 KASSERT(mp0 != NULL); 620 621 flags = MSG_DONTWAIT; 622 pr = so->so_proto; 623 mp = mp0; 624 type = 0; 625 626 *mp = NULL; 627 628 KASSERT(pr->pr_flags & PR_ATOMIC); 629 630 if (so->so_state & SS_ISCONFIRMING) 631 (*pr->pr_usrreq)(so, PRU_RCVD, NULL, NULL, NULL, curlwp); 632 restart: 633 if ((error = sblock(&so->so_rcv, M_NOWAIT)) != 0) { 634 return error; 635 } 636 m = so->so_rcv.sb_mb; 637 /* 638 * If we have less data than requested, do not block awaiting more. 639 */ 640 if (m == NULL) { 641 #ifdef DIAGNOSTIC 642 if (so->so_rcv.sb_cc) 643 panic("receive 1"); 644 #endif 645 if (so->so_error) { 646 error = so->so_error; 647 so->so_error = 0; 648 } else if (so->so_state & SS_CANTRCVMORE) 649 ; 650 else if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 651 && (so->so_proto->pr_flags & PR_CONNREQUIRED)) 652 error = ENOTCONN; 653 else 654 error = EWOULDBLOCK; 655 goto release; 656 } 657 /* 658 * On entry here, m points to the first record of the socket buffer. 659 * While we process the initial mbufs containing address and control 660 * info, we save a copy of m->m_nextpkt into nextrecord. 661 */ 662 if (curlwp != NULL) 663 curlwp->l_ru.ru_msgrcv++; 664 KASSERT(m == so->so_rcv.sb_mb); 665 SBLASTRECORDCHK(&so->so_rcv, "soreceive 1"); 666 SBLASTMBUFCHK(&so->so_rcv, "soreceive 1"); 667 nextrecord = m->m_nextpkt; 668 if (pr->pr_flags & PR_ADDR) { 669 #ifdef DIAGNOSTIC 670 if (m->m_type != MT_SONAME) 671 panic("receive 1a"); 672 #endif 673 sbfree(&so->so_rcv, m); 674 MFREE(m, so->so_rcv.sb_mb); 675 m = so->so_rcv.sb_mb; 676 } 677 while (m != NULL && m->m_type == MT_CONTROL && error == 0) { 678 sbfree(&so->so_rcv, m); 679 /* 680 * Dispose of any SCM_RIGHTS message that went 681 * through the read path rather than recv. 682 */ 683 if (pr->pr_domain->dom_dispose && 684 mtod(m, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) 685 (*pr->pr_domain->dom_dispose)(m); 686 MFREE(m, so->so_rcv.sb_mb); 687 m = so->so_rcv.sb_mb; 688 } 689 690 /* 691 * If m is non-NULL, we have some data to read. From now on, 692 * make sure to keep sb_lastrecord consistent when working on 693 * the last packet on the chain (nextrecord == NULL) and we 694 * change m->m_nextpkt. 695 */ 696 if (m != NULL) { 697 m->m_nextpkt = nextrecord; 698 /* 699 * If nextrecord == NULL (this is a single chain), 700 * then sb_lastrecord may not be valid here if m 701 * was changed earlier. 702 */ 703 if (nextrecord == NULL) { 704 KASSERT(so->so_rcv.sb_mb == m); 705 so->so_rcv.sb_lastrecord = m; 706 } 707 type = m->m_type; 708 if (type == MT_OOBDATA) 709 flags |= MSG_OOB; 710 } else { 711 KASSERT(so->so_rcv.sb_mb == m); 712 so->so_rcv.sb_mb = nextrecord; 713 SB_EMPTY_FIXUP(&so->so_rcv); 714 } 715 SBLASTRECORDCHK(&so->so_rcv, "soreceive 2"); 716 SBLASTMBUFCHK(&so->so_rcv, "soreceive 2"); 717 718 while (m != NULL) { 719 if (m->m_type == MT_OOBDATA) { 720 if (type != MT_OOBDATA) 721 break; 722 } else if (type == MT_OOBDATA) 723 break; 724 #ifdef DIAGNOSTIC 725 else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) 726 panic("receive 3"); 727 #endif 728 so->so_state &= ~SS_RCVATMARK; 729 if (so->so_oobmark != 0 && so->so_oobmark < m->m_len) 730 break; 731 len = m->m_len; 732 /* 733 * mp is set, just pass back the mbufs. 734 * Sockbuf must be consistent here (points to current mbuf, 735 * it points to next record) when we drop priority; 736 * we must note any additions to the sockbuf when we 737 * block interrupts again. 738 */ 739 if (m->m_flags & M_EOR) 740 flags |= MSG_EOR; 741 nextrecord = m->m_nextpkt; 742 sbfree(&so->so_rcv, m); 743 *mp = m; 744 mp = &m->m_next; 745 so->so_rcv.sb_mb = m = m->m_next; 746 *mp = NULL; 747 /* 748 * If m != NULL, we also know that 749 * so->so_rcv.sb_mb != NULL. 750 */ 751 KASSERT(so->so_rcv.sb_mb == m); 752 if (m) { 753 m->m_nextpkt = nextrecord; 754 if (nextrecord == NULL) 755 so->so_rcv.sb_lastrecord = m; 756 } else { 757 so->so_rcv.sb_mb = nextrecord; 758 SB_EMPTY_FIXUP(&so->so_rcv); 759 } 760 SBLASTRECORDCHK(&so->so_rcv, "soreceive 3"); 761 SBLASTMBUFCHK(&so->so_rcv, "soreceive 3"); 762 if (so->so_oobmark) { 763 so->so_oobmark -= len; 764 if (so->so_oobmark == 0) { 765 so->so_state |= SS_RCVATMARK; 766 break; 767 } 768 } 769 if (flags & MSG_EOR) 770 break; 771 } 772 773 if (m != NULL) { 774 m_freem(*mp); 775 *mp = NULL; 776 error = ENOMEM; 777 (void) sbdroprecord(&so->so_rcv); 778 } else { 779 /* 780 * First part is an inline SB_EMPTY_FIXUP(). Second 781 * part makes sure sb_lastrecord is up-to-date if 782 * there is still data in the socket buffer. 783 */ 784 so->so_rcv.sb_mb = nextrecord; 785 if (so->so_rcv.sb_mb == NULL) { 786 so->so_rcv.sb_mbtail = NULL; 787 so->so_rcv.sb_lastrecord = NULL; 788 } else if (nextrecord->m_nextpkt == NULL) 789 so->so_rcv.sb_lastrecord = nextrecord; 790 } 791 SBLASTRECORDCHK(&so->so_rcv, "soreceive 4"); 792 SBLASTMBUFCHK(&so->so_rcv, "soreceive 4"); 793 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 794 (*pr->pr_usrreq)(so, PRU_RCVD, NULL, 795 (struct mbuf *)(long)flags, NULL, curlwp); 796 if (*mp0 == NULL && (flags & MSG_EOR) == 0 && 797 (so->so_state & SS_CANTRCVMORE) == 0) { 798 sbunlock(&so->so_rcv); 799 goto restart; 800 } 801 802 release: 803 sbunlock(&so->so_rcv); 804 return error; 805 } 806 807 static struct socket * 808 gre_reconf(struct gre_softc *sc, const struct gre_soparm *newsoparm) 809 { 810 struct ifnet *ifp = &sc->sc_if; 811 812 GRE_DPRINTF(sc, "enter\n"); 813 814 shutdown: 815 if (sc->sc_soparm.sp_so != NULL) { 816 GRE_DPRINTF(sc, "\n"); 817 gre_upcall_remove(sc->sc_soparm.sp_so); 818 softint_disestablish(sc->sc_si); 819 sc->sc_si = NULL; 820 gre_fp_send(sc, GRE_M_DELFP, NULL); 821 gre_clearconf(&sc->sc_soparm, false); 822 } 823 824 if (newsoparm != NULL) { 825 GRE_DPRINTF(sc, "\n"); 826 sc->sc_soparm = *newsoparm; 827 newsoparm = NULL; 828 } 829 830 if (sc->sc_soparm.sp_so != NULL) { 831 GRE_DPRINTF(sc, "\n"); 832 sc->sc_si = softint_establish(SOFTINT_NET, greintr, sc); 833 gre_upcall_add(sc->sc_soparm.sp_so, sc); 834 if ((ifp->if_flags & IFF_UP) == 0) { 835 GRE_DPRINTF(sc, "down\n"); 836 goto shutdown; 837 } 838 } 839 840 GRE_DPRINTF(sc, "\n"); 841 if (sc->sc_soparm.sp_so != NULL) 842 sc->sc_if.if_flags |= IFF_RUNNING; 843 else { 844 gre_bufq_purge(&sc->sc_snd); 845 sc->sc_if.if_flags &= ~IFF_RUNNING; 846 } 847 return sc->sc_soparm.sp_so; 848 } 849 850 static int 851 gre_input(struct gre_softc *sc, struct mbuf *m, int hlen, 852 const struct gre_h *gh) 853 { 854 uint16_t flags; 855 uint32_t af; /* af passed to BPF tap */ 856 int isr, s; 857 struct ifqueue *ifq; 858 859 sc->sc_if.if_ipackets++; 860 sc->sc_if.if_ibytes += m->m_pkthdr.len; 861 862 hlen += sizeof(struct gre_h); 863 864 /* process GRE flags as packet can be of variable len */ 865 flags = ntohs(gh->flags); 866 867 /* Checksum & Offset are present */ 868 if ((flags & GRE_CP) | (flags & GRE_RP)) 869 hlen += 4; 870 /* We don't support routing fields (variable length) */ 871 if (flags & GRE_RP) { 872 sc->sc_if.if_ierrors++; 873 return 0; 874 } 875 if (flags & GRE_KP) 876 hlen += 4; 877 if (flags & GRE_SP) 878 hlen += 4; 879 880 switch (ntohs(gh->ptype)) { /* ethertypes */ 881 case ETHERTYPE_IP: 882 ifq = &ipintrq; 883 isr = NETISR_IP; 884 af = AF_INET; 885 break; 886 #ifdef NETATALK 887 case ETHERTYPE_ATALK: 888 ifq = &atintrq1; 889 isr = NETISR_ATALK; 890 af = AF_APPLETALK; 891 break; 892 #endif 893 #ifdef INET6 894 case ETHERTYPE_IPV6: 895 ifq = &ip6intrq; 896 isr = NETISR_IPV6; 897 af = AF_INET6; 898 break; 899 #endif 900 default: /* others not yet supported */ 901 GRE_DPRINTF(sc, "unhandled ethertype 0x%04x\n", 902 ntohs(gh->ptype)); 903 sc->sc_if.if_noproto++; 904 return 0; 905 } 906 907 if (hlen > m->m_pkthdr.len) { 908 m_freem(m); 909 sc->sc_if.if_ierrors++; 910 return EINVAL; 911 } 912 m_adj(m, hlen); 913 914 #if NBPFILTER > 0 915 if (sc->sc_if.if_bpf != NULL) 916 bpf_mtap_af(sc->sc_if.if_bpf, af, m); 917 #endif /*NBPFILTER > 0*/ 918 919 m->m_pkthdr.rcvif = &sc->sc_if; 920 921 s = splnet(); 922 if (IF_QFULL(ifq)) { 923 IF_DROP(ifq); 924 m_freem(m); 925 } else { 926 IF_ENQUEUE(ifq, m); 927 } 928 /* we need schednetisr since the address family may change */ 929 schednetisr(isr); 930 splx(s); 931 932 return 1; /* packet is done, no further processing needed */ 933 } 934 935 /* 936 * The output routine. Takes a packet and encapsulates it in the protocol 937 * given by sc->sc_soparm.sp_proto. See also RFC 1701 and RFC 2004 938 */ 939 static int 940 gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 941 struct rtentry *rt) 942 { 943 int error = 0; 944 struct gre_softc *sc = ifp->if_softc; 945 struct gre_h *gh; 946 struct ip *ip; 947 uint8_t ip_tos = 0; 948 uint16_t etype = 0; 949 950 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 951 m_freem(m); 952 error = ENETDOWN; 953 goto end; 954 } 955 956 #if NBPFILTER > 0 957 if (ifp->if_bpf != NULL) 958 bpf_mtap_af(ifp->if_bpf, dst->sa_family, m); 959 #endif 960 961 m->m_flags &= ~(M_BCAST|M_MCAST); 962 963 GRE_DPRINTF(sc, "dst->sa_family=%d\n", dst->sa_family); 964 switch (dst->sa_family) { 965 case AF_INET: 966 ip = mtod(m, struct ip *); 967 ip_tos = ip->ip_tos; 968 etype = htons(ETHERTYPE_IP); 969 break; 970 #ifdef NETATALK 971 case AF_APPLETALK: 972 etype = htons(ETHERTYPE_ATALK); 973 break; 974 #endif 975 #ifdef INET6 976 case AF_INET6: 977 etype = htons(ETHERTYPE_IPV6); 978 break; 979 #endif 980 default: 981 IF_DROP(&ifp->if_snd); 982 m_freem(m); 983 error = EAFNOSUPPORT; 984 goto end; 985 } 986 987 M_PREPEND(m, sizeof(*gh), M_DONTWAIT); 988 989 if (m == NULL) { 990 IF_DROP(&ifp->if_snd); 991 error = ENOBUFS; 992 goto end; 993 } 994 995 gh = mtod(m, struct gre_h *); 996 gh->flags = 0; 997 gh->ptype = etype; 998 /* XXX Need to handle IP ToS. Look at how I handle IP TTL. */ 999 1000 ifp->if_opackets++; 1001 ifp->if_obytes += m->m_pkthdr.len; 1002 1003 /* send it off */ 1004 if ((error = gre_bufq_enqueue(&sc->sc_snd, m)) != 0) { 1005 sc->sc_oflow_ev.ev_count++; 1006 m_freem(m); 1007 } else 1008 softint_schedule(sc->sc_si); 1009 end: 1010 if (error) 1011 ifp->if_oerrors++; 1012 return error; 1013 } 1014 1015 static int 1016 gre_getname(struct socket *so, int req, struct mbuf *nam, struct lwp *l) 1017 { 1018 return (*so->so_proto->pr_usrreq)(so, req, NULL, nam, NULL, l); 1019 } 1020 1021 static int 1022 gre_getsockname(struct socket *so, struct mbuf *nam, struct lwp *l) 1023 { 1024 return gre_getname(so, PRU_SOCKADDR, nam, l); 1025 } 1026 1027 static int 1028 gre_getpeername(struct socket *so, struct mbuf *nam, struct lwp *l) 1029 { 1030 return gre_getname(so, PRU_PEERADDR, nam, l); 1031 } 1032 1033 static int 1034 gre_getnames(struct socket *so, struct lwp *l, struct sockaddr_storage *src, 1035 struct sockaddr_storage *dst) 1036 { 1037 struct mbuf *m; 1038 struct sockaddr_storage *ss; 1039 int rc; 1040 1041 if ((m = getsombuf(so, MT_SONAME)) == NULL) 1042 return ENOBUFS; 1043 1044 ss = mtod(m, struct sockaddr_storage *); 1045 1046 solock(so); 1047 if ((rc = gre_getsockname(so, m, l)) != 0) 1048 goto out; 1049 *src = *ss; 1050 1051 if ((rc = gre_getpeername(so, m, l)) != 0) 1052 goto out; 1053 *dst = *ss; 1054 out: 1055 sounlock(so); 1056 m_freem(m); 1057 return rc; 1058 } 1059 1060 static void 1061 gre_fp_recvloop(void *arg) 1062 { 1063 struct gre_softc *sc = arg; 1064 1065 mutex_enter(&sc->sc_mtx); 1066 while (gre_fp_recv(sc)) 1067 ; 1068 mutex_exit(&sc->sc_mtx); 1069 kthread_exit(0); 1070 } 1071 1072 static bool 1073 gre_fp_recv(struct gre_softc *sc) 1074 { 1075 int fd, ofd, rc; 1076 file_t *fp; 1077 1078 fp = sc->sc_fp; 1079 ofd = sc->sc_fd; 1080 fd = -1; 1081 1082 switch (sc->sc_msg) { 1083 case GRE_M_STOP: 1084 cv_signal(&sc->sc_fp_condvar); 1085 return false; 1086 case GRE_M_SETFP: 1087 mutex_exit(&sc->sc_mtx); 1088 rc = fd_dup(fp, 0, &fd, 0); 1089 mutex_enter(&sc->sc_mtx); 1090 if (rc != 0) { 1091 sc->sc_msg = GRE_M_ERR; 1092 break; 1093 } 1094 /*FALLTHROUGH*/ 1095 case GRE_M_DELFP: 1096 mutex_exit(&sc->sc_mtx); 1097 if (ofd != -1 && fd_getfile(ofd) != NULL) 1098 fd_close(ofd); 1099 mutex_enter(&sc->sc_mtx); 1100 sc->sc_fd = fd; 1101 sc->sc_msg = GRE_M_OK; 1102 break; 1103 default: 1104 gre_fp_wait(sc); 1105 return true; 1106 } 1107 cv_signal(&sc->sc_fp_condvar); 1108 return true; 1109 } 1110 1111 static bool 1112 gre_fp_send(struct gre_softc *sc, enum gre_msg msg, file_t *fp) 1113 { 1114 bool rc; 1115 1116 mutex_enter(&sc->sc_mtx); 1117 while (sc->sc_msg != GRE_M_NONE) 1118 gre_fp_wait(sc); 1119 sc->sc_fp = fp; 1120 sc->sc_msg = msg; 1121 cv_signal(&sc->sc_fp_condvar); 1122 while (sc->sc_msg != GRE_M_STOP && sc->sc_msg != GRE_M_OK && 1123 sc->sc_msg != GRE_M_ERR) 1124 gre_fp_wait(sc); 1125 rc = (sc->sc_msg != GRE_M_ERR); 1126 sc->sc_msg = GRE_M_NONE; 1127 cv_signal(&sc->sc_fp_condvar); 1128 mutex_exit(&sc->sc_mtx); 1129 return rc; 1130 } 1131 1132 static int 1133 gre_ssock(struct ifnet *ifp, struct gre_soparm *sp, int fd) 1134 { 1135 int error = 0; 1136 const struct protosw *pr; 1137 file_t *fp; 1138 struct gre_softc *sc = ifp->if_softc; 1139 struct socket *so; 1140 struct sockaddr_storage dst, src; 1141 1142 if ((error = getsock(fd, &fp)) != 0) 1143 return error; 1144 1145 GRE_DPRINTF(sc, "\n"); 1146 1147 so = (struct socket *)fp->f_data; 1148 pr = so->so_proto; 1149 1150 GRE_DPRINTF(sc, "type %d, proto %d\n", pr->pr_type, pr->pr_protocol); 1151 1152 if ((pr->pr_flags & PR_ATOMIC) == 0 || 1153 (sp->sp_type != 0 && pr->pr_type != sp->sp_type) || 1154 (sp->sp_proto != 0 && pr->pr_protocol != 0 && 1155 pr->pr_protocol != sp->sp_proto)) { 1156 error = EINVAL; 1157 goto err; 1158 } 1159 1160 GRE_DPRINTF(sc, "\n"); 1161 1162 /* check address */ 1163 if ((error = gre_getnames(so, curlwp, &src, &dst)) != 0) 1164 goto err; 1165 1166 GRE_DPRINTF(sc, "\n"); 1167 1168 if (!gre_fp_send(sc, GRE_M_SETFP, fp)) { 1169 error = EBUSY; 1170 goto err; 1171 } 1172 1173 GRE_DPRINTF(sc, "\n"); 1174 1175 sp->sp_src = src; 1176 sp->sp_dst = dst; 1177 1178 sp->sp_so = so; 1179 1180 err: 1181 fd_putfile(fd); 1182 return error; 1183 } 1184 1185 static bool 1186 sockaddr_is_anyaddr(const struct sockaddr *sa) 1187 { 1188 socklen_t anylen, salen; 1189 const void *anyaddr, *addr; 1190 1191 if ((anyaddr = sockaddr_anyaddr(sa, &anylen)) == NULL || 1192 (addr = sockaddr_const_addr(sa, &salen)) == NULL) 1193 return false; 1194 1195 if (salen > anylen) 1196 return false; 1197 1198 return memcmp(anyaddr, addr, MIN(anylen, salen)) == 0; 1199 } 1200 1201 static bool 1202 gre_is_nullconf(const struct gre_soparm *sp) 1203 { 1204 return sockaddr_is_anyaddr(sstocsa(&sp->sp_src)) || 1205 sockaddr_is_anyaddr(sstocsa(&sp->sp_dst)); 1206 } 1207 1208 static void 1209 gre_clearconf(struct gre_soparm *sp, bool force) 1210 { 1211 if (sp->sp_bysock || force) { 1212 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1213 sockaddr_any(sstosa(&sp->sp_src))); 1214 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1215 sockaddr_any(sstosa(&sp->sp_dst))); 1216 sp->sp_bysock = false; 1217 } 1218 sp->sp_so = NULL; /* XXX */ 1219 } 1220 1221 static int 1222 gre_ioctl_lock(struct gre_softc *sc) 1223 { 1224 mutex_enter(&sc->sc_mtx); 1225 1226 while (sc->sc_state == GRE_S_IOCTL) 1227 gre_wait(sc); 1228 1229 if (sc->sc_state != GRE_S_IDLE) { 1230 cv_signal(&sc->sc_condvar); 1231 mutex_exit(&sc->sc_mtx); 1232 GRE_DPRINTF(sc, "\n"); 1233 return ENXIO; 1234 } 1235 1236 sc->sc_state = GRE_S_IOCTL; 1237 1238 mutex_exit(&sc->sc_mtx); 1239 return 0; 1240 } 1241 1242 static void 1243 gre_ioctl_unlock(struct gre_softc *sc) 1244 { 1245 mutex_enter(&sc->sc_mtx); 1246 1247 KASSERT(sc->sc_state == GRE_S_IOCTL); 1248 sc->sc_state = GRE_S_IDLE; 1249 cv_signal(&sc->sc_condvar); 1250 1251 mutex_exit(&sc->sc_mtx); 1252 } 1253 1254 static int 1255 gre_ioctl(struct ifnet *ifp, const u_long cmd, void *data) 1256 { 1257 struct ifreq *ifr; 1258 struct if_laddrreq *lifr = (struct if_laddrreq *)data; 1259 struct gre_softc *sc = ifp->if_softc; 1260 struct gre_soparm *sp; 1261 int fd, error = 0, oproto, otype, s; 1262 struct gre_soparm sp0; 1263 1264 ifr = data; 1265 1266 GRE_DPRINTF(sc, "cmd %lu\n", cmd); 1267 1268 switch (cmd) { 1269 case SIOCSIFFLAGS: 1270 case SIOCSIFMTU: 1271 case GRESPROTO: 1272 case GRESADDRD: 1273 case GRESADDRS: 1274 case GRESSOCK: 1275 case GREDSOCK: 1276 case SIOCSLIFPHYADDR: 1277 case SIOCDIFPHYADDR: 1278 if (kauth_authorize_network(curlwp->l_cred, 1279 KAUTH_NETWORK_INTERFACE, 1280 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1281 NULL) != 0) 1282 return EPERM; 1283 break; 1284 default: 1285 break; 1286 } 1287 1288 if ((error = gre_ioctl_lock(sc)) != 0) { 1289 GRE_DPRINTF(sc, "\n"); 1290 return error; 1291 } 1292 s = splnet(); 1293 1294 sp0 = sc->sc_soparm; 1295 sp0.sp_so = NULL; 1296 sp = &sp0; 1297 1298 GRE_DPRINTF(sc, "\n"); 1299 1300 switch (cmd) { 1301 case SIOCSIFADDR: 1302 GRE_DPRINTF(sc, "\n"); 1303 if ((ifp->if_flags & IFF_UP) != 0) 1304 break; 1305 gre_clearconf(sp, false); 1306 ifp->if_flags |= IFF_UP; 1307 goto mksocket; 1308 case SIOCSIFDSTADDR: 1309 break; 1310 case SIOCSIFFLAGS: 1311 oproto = sp->sp_proto; 1312 otype = sp->sp_type; 1313 switch (ifr->ifr_flags & (IFF_LINK0|IFF_LINK2)) { 1314 case IFF_LINK0|IFF_LINK2: 1315 sp->sp_proto = IPPROTO_UDP; 1316 sp->sp_type = SOCK_DGRAM; 1317 break; 1318 case IFF_LINK2: 1319 sp->sp_proto = 0; 1320 sp->sp_type = 0; 1321 break; 1322 case IFF_LINK0: 1323 sp->sp_proto = IPPROTO_GRE; 1324 sp->sp_type = SOCK_RAW; 1325 break; 1326 default: 1327 GRE_DPRINTF(sc, "\n"); 1328 error = EINVAL; 1329 goto out; 1330 } 1331 GRE_DPRINTF(sc, "\n"); 1332 gre_clearconf(sp, false); 1333 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == 1334 (IFF_UP|IFF_RUNNING) && 1335 (oproto == sp->sp_proto || sp->sp_proto == 0) && 1336 (otype == sp->sp_type || sp->sp_type == 0)) 1337 break; 1338 switch (sp->sp_proto) { 1339 case IPPROTO_UDP: 1340 case IPPROTO_GRE: 1341 goto mksocket; 1342 default: 1343 break; 1344 } 1345 break; 1346 case SIOCSIFMTU: 1347 /* XXX determine MTU automatically by probing w/ 1348 * XXX do-not-fragment packets? 1349 */ 1350 if (ifr->ifr_mtu < 576) { 1351 error = EINVAL; 1352 break; 1353 } 1354 /*FALLTHROUGH*/ 1355 case SIOCGIFMTU: 1356 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1357 error = 0; 1358 break; 1359 case SIOCADDMULTI: 1360 case SIOCDELMULTI: 1361 if (ifr == NULL) { 1362 error = EAFNOSUPPORT; 1363 break; 1364 } 1365 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 1366 #ifdef INET 1367 case AF_INET: 1368 break; 1369 #endif 1370 #ifdef INET6 1371 case AF_INET6: 1372 break; 1373 #endif 1374 default: 1375 error = EAFNOSUPPORT; 1376 break; 1377 } 1378 break; 1379 case GRESPROTO: 1380 gre_clearconf(sp, false); 1381 oproto = sp->sp_proto; 1382 otype = sp->sp_type; 1383 sp->sp_proto = ifr->ifr_flags; 1384 switch (sp->sp_proto) { 1385 case IPPROTO_UDP: 1386 ifp->if_flags |= IFF_LINK0|IFF_LINK2; 1387 sp->sp_type = SOCK_DGRAM; 1388 break; 1389 case IPPROTO_GRE: 1390 ifp->if_flags |= IFF_LINK0; 1391 ifp->if_flags &= ~IFF_LINK2; 1392 sp->sp_type = SOCK_RAW; 1393 break; 1394 case 0: 1395 ifp->if_flags &= ~IFF_LINK0; 1396 ifp->if_flags |= IFF_LINK2; 1397 sp->sp_type = 0; 1398 break; 1399 default: 1400 error = EPROTONOSUPPORT; 1401 break; 1402 } 1403 if ((oproto == sp->sp_proto || sp->sp_proto == 0) && 1404 (otype == sp->sp_type || sp->sp_type == 0)) 1405 break; 1406 switch (sp->sp_proto) { 1407 case IPPROTO_UDP: 1408 case IPPROTO_GRE: 1409 goto mksocket; 1410 default: 1411 break; 1412 } 1413 break; 1414 case GREGPROTO: 1415 ifr->ifr_flags = sp->sp_proto; 1416 break; 1417 case GRESADDRS: 1418 case GRESADDRD: 1419 gre_clearconf(sp, false); 1420 /* set tunnel endpoints and mark interface as up */ 1421 switch (cmd) { 1422 case GRESADDRS: 1423 sockaddr_copy(sstosa(&sp->sp_src), 1424 sizeof(sp->sp_src), ifreq_getaddr(cmd, ifr)); 1425 break; 1426 case GRESADDRD: 1427 sockaddr_copy(sstosa(&sp->sp_dst), 1428 sizeof(sp->sp_dst), ifreq_getaddr(cmd, ifr)); 1429 break; 1430 } 1431 checkaddr: 1432 if (sockaddr_any(sstosa(&sp->sp_src)) == NULL || 1433 sockaddr_any(sstosa(&sp->sp_dst)) == NULL) { 1434 error = EINVAL; 1435 break; 1436 } 1437 /* let gre_socreate() check the rest */ 1438 mksocket: 1439 GRE_DPRINTF(sc, "\n"); 1440 /* If we're administratively down, or the configuration 1441 * is empty, there's no use creating a socket. 1442 */ 1443 if ((ifp->if_flags & IFF_UP) == 0 || gre_is_nullconf(sp)) 1444 goto sendconf; 1445 1446 GRE_DPRINTF(sc, "\n"); 1447 fd = 0; 1448 error = gre_socreate(sc, sp, &fd); 1449 if (error != 0) 1450 break; 1451 1452 setsock: 1453 GRE_DPRINTF(sc, "\n"); 1454 1455 error = gre_ssock(ifp, sp, fd); 1456 1457 if (cmd != GRESSOCK) { 1458 GRE_DPRINTF(sc, "\n"); 1459 /* XXX v. dodgy */ 1460 if (fd_getfile(fd) != NULL) 1461 fd_close(fd); 1462 } 1463 1464 if (error == 0) { 1465 sendconf: 1466 GRE_DPRINTF(sc, "\n"); 1467 ifp->if_flags &= ~IFF_RUNNING; 1468 gre_reconf(sc, sp); 1469 } 1470 1471 break; 1472 case GREGADDRS: 1473 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_src)); 1474 break; 1475 case GREGADDRD: 1476 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_dst)); 1477 break; 1478 case GREDSOCK: 1479 GRE_DPRINTF(sc, "\n"); 1480 if (sp->sp_bysock) 1481 ifp->if_flags &= ~IFF_UP; 1482 gre_clearconf(sp, false); 1483 goto mksocket; 1484 case GRESSOCK: 1485 GRE_DPRINTF(sc, "\n"); 1486 gre_clearconf(sp, true); 1487 fd = (int)ifr->ifr_value; 1488 sp->sp_bysock = true; 1489 ifp->if_flags |= IFF_UP; 1490 goto setsock; 1491 case SIOCSLIFPHYADDR: 1492 GRE_DPRINTF(sc, "\n"); 1493 if (lifr->addr.ss_family != lifr->dstaddr.ss_family) { 1494 error = EAFNOSUPPORT; 1495 break; 1496 } 1497 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1498 sstosa(&lifr->addr)); 1499 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1500 sstosa(&lifr->dstaddr)); 1501 GRE_DPRINTF(sc, "\n"); 1502 goto checkaddr; 1503 case SIOCDIFPHYADDR: 1504 GRE_DPRINTF(sc, "\n"); 1505 gre_clearconf(sp, true); 1506 ifp->if_flags &= ~IFF_UP; 1507 goto mksocket; 1508 case SIOCGLIFPHYADDR: 1509 GRE_DPRINTF(sc, "\n"); 1510 if (gre_is_nullconf(sp)) { 1511 error = EADDRNOTAVAIL; 1512 break; 1513 } 1514 sockaddr_copy(sstosa(&lifr->addr), sizeof(lifr->addr), 1515 sstosa(&sp->sp_src)); 1516 sockaddr_copy(sstosa(&lifr->dstaddr), sizeof(lifr->dstaddr), 1517 sstosa(&sp->sp_dst)); 1518 GRE_DPRINTF(sc, "\n"); 1519 break; 1520 default: 1521 error = EINVAL; 1522 break; 1523 } 1524 out: 1525 GRE_DPRINTF(sc, "\n"); 1526 splx(s); 1527 gre_ioctl_unlock(sc); 1528 return error; 1529 } 1530 1531 #endif 1532 1533 void greattach(int); 1534 1535 /* ARGSUSED */ 1536 void 1537 greattach(int count) 1538 { 1539 #ifdef INET 1540 if_clone_attach(&gre_cloner); 1541 #endif 1542 } 1543